Electric temperature-alarm.



PATENTED FEB. '7, 1905.

C. P. HEPLER.

ELEGTRIG TEMPERATURE ALARM.

APPLIUATION FILED FEB. 20, 1904.

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UNITED STATES Patented February 7, 1905.

OOVVAN PATTERSON HEPLER, OE SMITHTON, PENNSYLVANIA.

ELECTRIC TEIVIFERATUFiE-ALAFNLl SPECIFICATION forming part of LettersPatent No. 782,131, dated February 7, 1905.

Application filed February Z0, 1904. Serial No. 194,507.

T all whom, t may conc/5772,:

Be it known that I, OowAN PATTERSON HEP- LER, a citizen of the UnitedStates, and a resident of Smithton, in the county of Testmoreland andState of Pennsylvania, have invented a new and Improved ElectricTemperature- Alarm, of which the following is a full, clear, and exactdescription.

My invention relates to an electric alarm for giving a signal when thecontents of a receptacle have reached any certain predeterminedtemperature.

The objects of my invention are to provide an alarm of the characterindicated above which will be adjustable, so that it may be set for anydesired temperature, which will be entirely automatic in operation, andwhich will be useful to a large number of different kinds ofmanufacturers-for instance, distillers and brewers, bakers,confectioners, zc.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar characters of reference indicatecorresponding parts in all the figures.

Eigu re 1 is a side view, partly broken away, showing` a tank providedwith my invention. Fig. 2 is an enlarged sectional view showing thedetails of a preferred form of my invention. Fig. 3 is a front view ofthe same, and

Fig. 4 is a sectional view on the line 1 4. of

Eig. 3.

ln the drawings, t represents a tank containing a boiling liquid or thelike.

shows the alarm device proper, c the electric connections from it, and(Z a bell by which the alarm is given.

In detail my alarm device is preferably made with a flattened bulb 1,from which rises a tube 2, lined with an insulating-tubeY sition bymeans of the set-screw 8. In contact with the collar G is placed aconnection 9, provided with a binding-screw 10, to which is attached awire 11, leading to one of the outside wires c.

Upon the casing of the instrument, which is preferably made of metal, issecured a binding-post 12, which holds a wire 13, which is in connectionwith the other outside wire c. Upon the upper end of the rod 7 is aprojection 1a, which is designed to always be in contact with a scale15, attached to the back of the casing. The scale 15 is preferablyformed of hard rubber and provided with numerals to indicate thetemperature at which it is desired to set the instrument. The projection14 is preferably formed of spring material and is of sufficient lengthto come into close contact with the scale, so that it will not be easilydisplaced. lt will be observedv that the rod 7, which is in connectionwith the parts 6, 9, 10, and 11, is entirely insulated from the casingof the instrument and fromthe receptacle for the mercury. T he casing ispreferably provided with a cover 16, secured by thumbscrews 17 andhaving' a packing' 18.

The operation will be obvious. Vhen the mercury expands suliiciently toreach the rod 7, connections through the wires 11, 12, and c will bemade to the bell (Z through a battery v(not shown) and cause the alarmto be given.

The scale will of course be calibrated for the particular use for whichthe instrument is constructed.

The outside casing parts 1, 2, 1, 6, 7, 9, 10, and 12 should be made ofmetal, preferably brass.

lt will be obvious that many changes may be made in the construction ofthe apparatus without departing from the spirit of my invention as setforth in the claims, and l do not wish to be limited to the exactconstruction shown in the drawings.

Having thus described my invention, l claim as new and desire to secureby Letters Patent 9 5 1. An alarm device comprising' a bulb containingan expansible liquid, a tube extending therefrom, a conducting-rodextending into said tube, a projection lixed to said rod, a scale, meansfor adjusting said rod to lix the IOO extending` into said receptacle,insulation between said rod and said receptacle, a scale of insulatingmaterial, a projection tixedly secured on said rod and adapted to reston said scale, and means for securing said rod in adjusted positions.

In testimony whereof lhave signed my name to this specification in thepresence of two subscribing witnesses.

COWAN PATTERSON HEPLER.

Witnesses:

R. H. WOLF, J. C. SMITH.

